/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/*
 * Copyright (C) 2005 Novell, Inc.
 *
 * Nautilus is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * Nautilus is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; see the file COPYING.  If not,
 * write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * Author: Anders Carlsson <andersca@imendio.com>
 *
 */

#include <config.h>
#include "credenza-search-engine-beagle.h"

#include <eel/eel-gtk-macros.h>
#include <eel/eel-glib-extensions.h>
#include <gmodule.h>

typedef struct _BeagleHit BeagleHit;
typedef struct _BeagleQuery BeagleQuery;
typedef struct _BeagleClient BeagleClient;
typedef struct _BeagleRequest BeagleRequest;
typedef struct _BeagleFinishedResponse BeagleFinishedResponse;
typedef struct _BeagleHitsAddedResponse BeagleHitsAddedResponse;
typedef struct _BeagleQueryPartProperty BeagleQueryPartProperty;
typedef struct _BeagleQueryPart BeagleQueryPart;
typedef struct _BeagleHitsSubtractedResponse BeagleHitsSubtractedResponse;

struct CredenzaSearchEngineBeagleDetails {
	BeagleClient *client;
	CredenzaQuery *query;

	BeagleQuery *current_query;
	char *current_query_uri_prefix;
	gboolean query_finished;
};

/* We dlopen() all the following from libbeagle at runtime */
#define BEAGLE_HIT(x) ((BeagleHit *)(x))
#define BEAGLE_REQUEST(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), beagle_request_get_type(), BeagleRequest))
#define BEAGLE_QUERY_PART(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), beagle_query_part_get_type(), BeagleQueryPart))

typedef enum {
	BEAGLE_QUERY_PART_LOGIC_REQUIRED   = 1,
	BEAGLE_QUERY_PART_LOGIC_PROHIBITED = 2
} BeagleQueryPartLogic;

typedef enum {
	BEAGLE_PROPERTY_TYPE_UNKNOWN = 0,
	BEAGLE_PROPERTY_TYPE_TEXT    = 1,
	BEAGLE_PROPERTY_TYPE_KEYWORD = 2,
	BEAGLE_PROPERTY_TYPE_DATE    = 3,
	BEAGLE_PROPERTY_TYPE_LAST    = 4
} BeaglePropertyType;

/* *static* wrapper function pointers */
static gboolean (*beagle_client_send_request_async) (BeagleClient  *client,
                                                    BeagleRequest  *request,
                                                    GError        **err) = NULL;
static G_CONST_RETURN char *(*beagle_hit_get_uri) (BeagleHit *hit) = NULL;
static GSList *(*beagle_hits_added_response_get_hits) (BeagleHitsAddedResponse *response) = NULL;
static BeagleQuery *(*beagle_query_new) (void) = NULL;
static void (*beagle_query_add_text) (BeagleQuery     *query,
				      const char      *str) = NULL;
static BeagleQueryPartProperty *(*beagle_query_part_property_new) (void) = NULL;
static void (*beagle_query_part_set_logic) (BeagleQueryPart      *part,
					    BeagleQueryPartLogic  logic) = NULL;
static void (*beagle_query_part_property_set_key) (BeagleQueryPartProperty *part,
						   const char              *key) = NULL;
static void (*beagle_query_part_property_set_value) (BeagleQueryPartProperty *part,
						     const char *             value) = NULL;
static void (*beagle_query_part_property_set_property_type) (BeagleQueryPartProperty *part,
							     BeaglePropertyType       prop_type) = NULL;
static void (*beagle_query_add_part) (BeagleQuery     *query,
				      BeagleQueryPart *part) = NULL;
static GType (*beagle_request_get_type) (void) = NULL;
static GType (*beagle_query_part_get_type) (void) = NULL;
static gboolean (*beagle_util_daemon_is_running) (void) = NULL;
static BeagleClient *(*beagle_client_new_real) (const char *client_name) = NULL;
static void (*beagle_query_set_max_hits) (BeagleQuery *query,
					  int max_hits) = NULL;
static GSList *(*beagle_hits_subtracted_response_get_uris) (BeagleHitsSubtractedResponse *response) = NULL;

static struct BeagleDlMapping
{
  const char *fn_name;
  gpointer *fn_ptr_ref;
} beagle_dl_mapping[] =
{
#define MAP(a) { #a, (gpointer *)&a }
  MAP (beagle_client_send_request_async),
  MAP (beagle_hit_get_uri),
  MAP (beagle_hits_added_response_get_hits),
  MAP (beagle_query_new),
  MAP (beagle_query_add_text),
  MAP (beagle_query_part_property_new),
  MAP (beagle_query_part_set_logic),
  MAP (beagle_query_part_property_set_key),
  MAP (beagle_query_part_property_set_value),
  MAP (beagle_query_part_property_set_property_type),
  MAP (beagle_query_add_part),
  MAP (beagle_request_get_type),
  MAP (beagle_query_part_get_type),
  MAP (beagle_util_daemon_is_running),
  MAP (beagle_query_set_max_hits),
  MAP (beagle_hits_subtracted_response_get_uris),
#undef MAP
  { "beagle_client_new", (gpointer *)&beagle_client_new_real },
};

static void 
open_libbeagle (void)
{
  static gboolean done = FALSE;

  if (!done)
    {
      int i;
      GModule *beagle;
      
      done = TRUE;
 
      beagle = g_module_open ("libbeagle.so.1", G_MODULE_BIND_LAZY | G_MODULE_BIND_LOCAL);
      if (!beagle)
	return;
      
      for (i = 0; i < G_N_ELEMENTS (beagle_dl_mapping); i++)
	{
	  if (!g_module_symbol (beagle, beagle_dl_mapping[i].fn_name,
				beagle_dl_mapping[i].fn_ptr_ref))
	    {
	      g_warning ("Missing symbol '%s' in libbeagle\n",
			 beagle_dl_mapping[i].fn_name);
	      g_module_close (beagle);

	      for (i = 0; i < G_N_ELEMENTS (beagle_dl_mapping); i++)
		beagle_dl_mapping[i].fn_ptr_ref = NULL;

	      return;
	    }
	}
    }
}

static BeagleClient *
beagle_client_new (const char *client_name)
{
  if (beagle_client_new_real)
    return beagle_client_new_real (client_name);

  return NULL;
}

static void  credenza_search_engine_beagle_class_init       (CredenzaSearchEngineBeagleClass *class);
static void  credenza_search_engine_beagle_init             (CredenzaSearchEngineBeagle      *engine);

G_DEFINE_TYPE (CredenzaSearchEngineBeagle,
	       credenza_search_engine_beagle,
	       CREDENZA_TYPE_SEARCH_ENGINE);

static CredenzaSearchEngineClass *parent_class = NULL;

static void
finalize (GObject *object)
{
	CredenzaSearchEngineBeagle *beagle;

	beagle = CREDENZA_SEARCH_ENGINE_BEAGLE (object);
	
	if (beagle->details->current_query) {
		g_object_unref (beagle->details->current_query);
		beagle->details->current_query = NULL;
		g_free (beagle->details->current_query_uri_prefix);
		beagle->details->current_query_uri_prefix = NULL;
	}

	if (beagle->details->query) {
		g_object_unref (beagle->details->query);
		beagle->details->query = NULL;
	}

	if (beagle->details->client) {
		g_object_unref (beagle->details->client);
		beagle->details->client = NULL;
	}

	g_free (beagle->details);

	EEL_CALL_PARENT (G_OBJECT_CLASS, finalize, (object));
}

static void
beagle_hits_added (BeagleQuery *query, 
		   BeagleHitsAddedResponse *response, 
		   CredenzaSearchEngineBeagle *engine)
{
	GSList *hits, *list;
	GList *hit_uris;
	const char *uri;

	hit_uris = NULL;

	hits = beagle_hits_added_response_get_hits (response);
	
	for (list = hits; list != NULL; list = list->next) {
		BeagleHit *hit = BEAGLE_HIT (list->data);

		uri = beagle_hit_get_uri (hit);

		if (engine->details->current_query_uri_prefix &&
		    !g_str_has_prefix (uri, engine->details->current_query_uri_prefix)) {
			continue;
		}
		
		hit_uris = g_list_prepend (hit_uris, (char *)uri);
	}

	credenza_search_engine_hits_added (CREDENZA_SEARCH_ENGINE (engine), hit_uris);
	g_list_free (hit_uris);
}

static void
beagle_hits_subtracted (BeagleQuery *query, 
			BeagleHitsSubtractedResponse *response, 
			CredenzaSearchEngineBeagle *engine)
{
	GSList *uris, *list;
	GList *hit_uris;

	hit_uris = NULL;

	uris = beagle_hits_subtracted_response_get_uris (response);
	
	for (list = uris; list != NULL; list = list->next) {
		hit_uris = g_list_prepend (hit_uris, (char *)list->data);
	}

	credenza_search_engine_hits_subtracted (CREDENZA_SEARCH_ENGINE (engine), hit_uris);
	g_list_free (hit_uris);
}

static void
beagle_finished (BeagleQuery *query, 
		 BeagleFinishedResponse *response,
		 CredenzaSearchEngineBeagle *engine)
{
	/* For some reason we keep getting finished events,
	 * only emit finished once */
	if (engine->details->query_finished) {
		return;
	}
	
	engine->details->query_finished = TRUE;
	credenza_search_engine_finished (CREDENZA_SEARCH_ENGINE (engine));
}

static void
beagle_error (BeagleQuery *query,
	      GError *error,
	      CredenzaSearchEngineBeagle *engine)
{
	credenza_search_engine_error (CREDENZA_SEARCH_ENGINE (engine), error->message);
}

static void
credenza_search_engine_beagle_start (CredenzaSearchEngine *engine)
{
	CredenzaSearchEngineBeagle *beagle;
	GError *error;
	GList *mimetypes, *l;
	char *text, *mimetype;

	error = NULL;
	beagle = CREDENZA_SEARCH_ENGINE_BEAGLE (engine);

	if (beagle->details->current_query) {
		return;
	}

	beagle->details->query_finished = FALSE;
	beagle->details->current_query = beagle_query_new ();
	g_signal_connect (beagle->details->current_query,
			  "hits-added", G_CALLBACK (beagle_hits_added), engine);
	g_signal_connect (beagle->details->current_query,
			  "hits-subtracted", G_CALLBACK (beagle_hits_subtracted), engine);
	g_signal_connect (beagle->details->current_query,
			  "finished", G_CALLBACK (beagle_finished), engine);
	g_signal_connect (beagle->details->current_query,
			  "error", G_CALLBACK (beagle_error), engine);

	/* We only want files */
	beagle_query_add_text (beagle->details->current_query," type:File");
				   
	beagle_query_set_max_hits (beagle->details->current_query,
				   1000);
	
	text = credenza_query_get_text (beagle->details->query);
	beagle_query_add_text (beagle->details->current_query,
			       text);

	mimetypes = credenza_query_get_mime_types (beagle->details->query);
	for (l = mimetypes; l != NULL; l = l->next) {
		char* temp;
		mimetype = l->data;
		temp = g_strconcat (" mimetype:", mimetype, NULL);
		beagle_query_add_text (beagle->details->current_query,temp);
		g_free (temp);
	}

	beagle->details->current_query_uri_prefix = credenza_query_get_location (beagle->details->query);
	
	if (!beagle_client_send_request_async (beagle->details->client,
					       BEAGLE_REQUEST (beagle->details->current_query), &error)) {
		credenza_search_engine_error (engine, error->message);
		g_error_free (error);
	}

	/* These must live during the lifetime of the query */
	g_free (text);
	eel_g_list_free_deep (mimetypes);
}

static void
credenza_search_engine_beagle_stop (CredenzaSearchEngine *engine)
{
	CredenzaSearchEngineBeagle *beagle;

	beagle = CREDENZA_SEARCH_ENGINE_BEAGLE (engine);

	if (beagle->details->current_query) {
		g_object_unref (beagle->details->current_query);
		beagle->details->current_query = NULL;
		g_free (beagle->details->current_query_uri_prefix);
		beagle->details->current_query_uri_prefix = NULL;
	}
}

static gboolean
credenza_search_engine_beagle_is_indexed (CredenzaSearchEngine *engine)
{
	return TRUE;
}

static void
credenza_search_engine_beagle_set_query (CredenzaSearchEngine *engine, CredenzaQuery *query)
{
	CredenzaSearchEngineBeagle *beagle;

	beagle = CREDENZA_SEARCH_ENGINE_BEAGLE (engine);

	if (query) {
		g_object_ref (query);
	}

	if (beagle->details->query) {
		g_object_unref (beagle->details->query);
	}

	beagle->details->query = query;
}

static void
credenza_search_engine_beagle_class_init (CredenzaSearchEngineBeagleClass *class)
{
	GObjectClass *gobject_class;
	CredenzaSearchEngineClass *engine_class;

	parent_class = g_type_class_peek_parent (class);

	gobject_class = G_OBJECT_CLASS (class);
	gobject_class->finalize = finalize;

	engine_class = CREDENZA_SEARCH_ENGINE_CLASS (class);
	engine_class->set_query = credenza_search_engine_beagle_set_query;
	engine_class->start = credenza_search_engine_beagle_start;
	engine_class->stop = credenza_search_engine_beagle_stop;
	engine_class->is_indexed = credenza_search_engine_beagle_is_indexed;
}

static void
credenza_search_engine_beagle_init (CredenzaSearchEngineBeagle *engine)
{
	engine->details = g_new0 (CredenzaSearchEngineBeagleDetails, 1);
}


CredenzaSearchEngine *
credenza_search_engine_beagle_new (void)
{
	CredenzaSearchEngineBeagle *engine;
	BeagleClient *client;

	open_libbeagle ();
	
	if (beagle_util_daemon_is_running == NULL ||
	    !beagle_util_daemon_is_running ()) {
		/* check whether daemon is running as beagle_client_new
		 * doesn't fail when a stale socket file exists */
		return NULL;
	}

	client = beagle_client_new (NULL);

	if (client == NULL) {
		return NULL;
	}
	
	engine = g_object_new (CREDENZA_TYPE_SEARCH_ENGINE_BEAGLE, NULL);
	
	engine->details->client = client;

	return CREDENZA_SEARCH_ENGINE (engine);
}
